Players are able to create ghost lily pads

Is this still a concern in the latest Minecraft version 13w48b? If so, please update the affected versions in order to best aid Mojang ensuring bugs are still valid in the latest releases/pre-releases.

Confirmed in 1.7.4
Also, any block placed over the clone lilypad disappears (client-side)
(At the server side, the block isn't placed at all)

Confirmed.

Confirmed in 1.8.

Is this still an issue in the current Minecraft Snapshot 15w47a or later? If so, please update the affected versions in order to best aid Mojang ensuring bugs are still valid in the latest releases/pre-releases.

Probably the same issue, you can also create ghost lily pads easier by walking across water with frost walker enchantment while placing them down

Cannot reproduce in 21w11a - assuming fixed

Cannot reproduce anymore in 21w11a.

Also unable to reproduce in 11a. Unaware if it's been fixed in this specific release or an earlier one.

21w11a specifically